描述 Description

The LM251772 is a four switch Buck-Boost controller. It provides a regulated output voltage if the input voltage is higher, equal or lower than the adjusted output voltage. In power save mode the device supports very high efficiency over the complete operation range of the output. The output voltage and average current can be dynamically programmed via the integrated I2C interface. The configuration range for output voltage and average current meet the USB-PD standard requirements. The integrated DRV pin can control a disconnect FET to support dual role port (DRP) requirements.

特性 Features

Input range from 3.5V to 36V

Dynamical Vo programming via I2C from:

3.3V up to 48V in 20mV steps

1V up to 24V in 10mV steps



Peak current regulation control

Small voltage transition ripple over all operating modes

Shut down quiescent current 3μA

Operating quiescent current 60μA

Drive (DRV) pin for dual role port power path

Push-Pull output for fast pMOS FET control

Configurable as charge pump driver stage for nMOS FET



Operation mode selection for high efficiency in light load and high load conditions:

Power save mode (Single Pulse/μSleep)

Automatic conduction mode



Integrated high voltage supply LDO

Auxiliary high voltage LDO for PD-controller supply

Integrated full-bridge gate drive

2A peak current capability

Bootstrap over and under-voltage protection

Integrated boot-strap diode



Fixed frequency independent from operating mode (boost, buck-boost, buck)

Forced PWM mode selectable

Switching frequency from 100kHz to 600kHz

External clock synchronization and clock output



Average input or output current sensor

Programmable from 0.5A to 7A in 50mA steps

ISET pin selectable



I2C Interface readout of monitoring features

Commercial temperature range (Tj = 0°C to 70°C)

Create a custom design using the LM251772 with the WEBENCH? Power Designer